Smoke Visibility Tester made of a plywood chamber inner side painted by heat proof paint the ceiling of the chamber have a hole which permits to hold light meter cell while testing. There is a hole in the bottom of the chamber, which is aligning to the ceiling hole. There is a clear glass bulb fitted to the bottom hole. The left-hand side of the chamber has a hole, an exhaust fan fitted to the left-hand side hole. The right-hand side has a hole which permits to flow air at the time of the exhaust of the smoke to the chamber. The front of the chamber has a hinged door, which has a clear glass window on the door. There are shutters on the left-hand side and the right-hand side hole of the chamber. The LUX of the bulb control with the help of an electronics regulator fitted in the panel of the instrument. The ceiling hole and the front glass window covered with the black curtain. The chamber fitted on the section stand. A LUX meter is supplied with the instrument for the measurement of the LUX of the light. There is an aluminum silicate and a stainless steel plate also supplied with the instrument. There is a stainless steel specimen frame tilted at 20?a to the vertical and have the provision to hold the specimen and there is provision to slide the specimen frame. There is a burner mounted on the bottom of the chamber at an angle of 45. A flow meter, pressure gauge and pressure regulator are fitted on the section frame for the adjustment of the supply of the gas. All the parts are painted or polished for the corrosion resistance long life. We will not supply any gas with the instrument.